      {:tag :w:unhideWhenUsed :attrs nil :content nil}]}])
 
 (defn when-v-tag
-  "Returns an xml tag node when the value exists."
+  "Returns an XML tag node when the value exists."
   [v tag]
   (cond (nil? v) nil
         (= "" v) {:tag tag}

    (cons styles-xml-resource custom-resources)))

(defn- resource-type-override
  "Returns Override xml tag node of given resource information map.
  Called by content-types-xml."
  [{:keys [content-type part-name]}]
  {:tag :Override

                  (map resource-type-override resources))})

(defn doc-props-app-xml
  "Creates XML data for docProps/app.xml file in DOCX pakcage.

  Parameters:
  - & properties: option, value, ...
